fixed a couple issues

libswan/include/swan/swan.h

@@ -9,6 +9,7 @@
 #include <swan/Game.h>
 #include <swan/Item.h>
 #include <swan/Mod.h>
+#include <swan/PerfCounter.h>
 #include <swan/OS.h>
 #include <swan/Resource.h>
 #include <swan/SRF.h>

libswan/src/Resource.cc

@@ -97,7 +97,7 @@ std::unique_ptr<ImageResource> ImageResource::createInvalid(Win &win) {
 }
 
 ResourceManager::ResourceManager(Win &win) {
-	addImage(std::move(ImageResource::createInvalid(win)));
+	addImage(ImageResource::createInvalid(win));
 }
 
 void ResourceManager::tick(float dt) {

libswan/src/WorldPlane.cc

@@ -164,11 +164,10 @@ void WorldPlane::tick(float dt) {
 	for (auto &ent: entities_)
 		ent->tick(getContext(), dt);
 
-	for (auto &chunk: active_chunks_) {
+	for (auto &chunk: active_chunks_)
 		chunk->tick(dt);
-		if (!chunk->isActive())
-			active_chunks_.erase(chunk);
-	}
+
+	std::erase_if(active_chunks_, [](Chunk *chunk) { return !chunk->isActive(); });
 }
 
 void WorldPlane::debugBox(TilePos pos) {